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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd39b2507f5eec46051e87922673a06cc69a6613d797b852e69e260fec8b6bbe' 
  AND token = 'lZnoonSFm3JUkm4kuSa8x4jb8GOIek9Yb3QJGbsZbaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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