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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51fe3e284887aceefd7ea2ce1b61feebd056210ccf8913314f1da6dba7701558' 
  AND token = 'SYtMDHWn+JFQqQn5yiMTYJ5C8RewwsU/Y8lvm4xCyBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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