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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014c7dc2877d04ba15471619192ea877cc3900c4a8d3522daeb329033c4fece9' 
  AND token = '5fXUYVqt2EJoopsQdTdYeSGXGw0hAjYpyB0ptoV8G6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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