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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdedc1ef692237f7b7c1743c9e7da73ac020fce10d6c607ed0e8370084b69669' 
  AND token = 'xXsKPwCJ/+I/AsKOb6xrtJEJ1U1ToQrouB5q70LlKCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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