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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00aeccc73a4a33e31eb08b95ab40b518966bb56386a4faf18d40bd1d52a0bd5b' 
  AND token = '3ZgX3BF8Wz8716RYF0g3BRsUQMG6pQzzJnjgWKCg4FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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