SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddabeeaa446526508a5baad6a88b4ad59d45fa2fb5e6fb0a718c67b7909dc138' 
  AND token = 'solzQ6z491qx/cd9a2o/C/94t3OSIflQMVcY/qdNCsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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