SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea017a6c5a5ac958b8f1f119b36fe255c6dce9045d79a14690781946bdb65f2' 
  AND token = 'z7GmR3RCoQ9s3HjBWZQLPfOASejLQn9okJ65JvVlMYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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