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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9ccaed4ed7286e0a832a74bd83ca57d937b5eaf22186b28a1ca99552d5bf93' 
  AND token = 'KkN5fnoQzTEN1w1WGW9vNSjSwy7Or1BYhEYs0m1pvfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}