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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'debd75764da6d7f90cda399eb60a8b1d6242f1cc7c43121f8705310c368887bd' 
  AND token = 'sQlgD3Gu0fMaC/EVkZi9h+7xd2M/Rxgd/4K2RQpyfYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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