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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22b1439944e7062034ee76ca8c655a76d95054af1dfd184acb04b5af02952ea2' 
  AND token = 'CONsFw8VIOUBUS9eCh4D6yXasR9TWXxcrAUqAKHcNf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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