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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1330a580cb43ad6c88c24fe72ac8d192aed652cee7e00c5581e34eda6c08fee7' 
  AND token = 'oq2rMWUv7pQOK6ZKf6o8ovkXhhazUatP50d/jRTE6+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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