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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d515e328e6729f2ee73111ec8a1a659bbeaee944c79e2c98c5b098a985db7ee' 
  AND token = 'uxK+dqSXKgpZcekQl5bd6ei2x0yoAmksrFyUazYNC7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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