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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368761a5d58c0ecb50808d426b573f8628d5c7062d27f8e9bdea2d0f54f62c60' 
  AND token = 'LmZ/4uDg0VNO9oVa2YerjRAa3qmUOw6ujKJN4/pWcbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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