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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5207dad120c9f43fc0a441d173d176043e631bedcc63b7dad404ca9be77443a' 
  AND token = '6jnqi68Zhxh39dbWMdb7OIu6e4H0N6D+4MpO+YUiiOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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