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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b676b6929c955e5a44444431ad356ca10b332ce4f49763f75032fbd4766433b' 
  AND token = 'HHkwTW6CdseFMzOIcfiaPF5MhlsIJkQn6N3YoVIkURc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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