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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1714bb18abe3ce97632352ea53eed1b2c021bdacc60d0cfb259ec9e8d689818d' 
  AND token = '1FD7HNsCBcK+ISDNJgf0wN5eYnX9NRx49HyX6pZI2X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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