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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8928bcc473065d2880e49cb84275db63efe92e31c40d9f75c80b003d05d60ed9' 
  AND token = 'OBcSRq7u6QaDHrpin0ANitFl/2zhefRvEoee8VtBD/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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