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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7d9fda5b239842626f2dbbe511fb6140cc09756cecde051a9b50f477bc1631' 
  AND token = '5pm6LLUFTHeGPZytY0u71lm+OQ1fbqkakJfh7ZUg38s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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