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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2b936d0252d9c0aaf6fb494cc908366f65330623e3ea3f1b3f1d980b8e2a45' 
  AND token = 'YuiqQTP033//E5jCjXXq0omXmK9ZfGohzisJaF5irDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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