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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad47771c6f278ea617beb701e1533fcf1c7fc79e00241c383355ae2ed112e9a' 
  AND token = '+euUzO9IwKFtYzE0U32xmOoy/BSwe3Z+/KQCpQlz+7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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