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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaaabfc97e86afee15019f5facd1df83e840243e4b0bc65a25a2b089a646bf23' 
  AND token = '8ouhcCkGXQGHZO3pao2yT+0CQDRD5dQi2gaQAa/WWdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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