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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a7ab0048075d217f6fcf14cf9d15b988937f6c24d7814e7916f09efb54e841' 
  AND token = 'mso9JhQ136DpgWG7L32C1jCIOOYY3ltQjK5oF072uxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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