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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079372d7021bd1e728fb23eb8f4d2b3fd056d4750ca21aeaf1006ecc157a00e3' 
  AND token = 'N7KZ0PfHU2sXlYIkhkFksDC2zqp9amNJ4xoi869D+yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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