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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e11e858f40a038bed8ae4b71b734889b181c91335ced4b135b3fae8a3419960' 
  AND token = 'WjhD5BG7gQoSBj7FT6CM2a2ZihsZ5NyT3TjeiNmTG58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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