SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fee01fa4eb894d117488adbf036013bd90d30852e9eb98bc606221a2d6777b' 
  AND token = 'tFgGFhv9OQiEnQu1VJlko0DVRbHVRnyD9GPErwsR7oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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