SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8c59ce436375a1089d547a7b9fba04eb8559aeb9c2eb9ec004ca2a9c195b49' 
  AND token = 'BFdY8hKAW6+7iwBdFp6sJE3CNRpQGhZ+OsV2j+e+mLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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