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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca36a423c2e94d91ed2f25385a9da6be724e5e3f6db3d31ae1b427d0cd8a54f' 
  AND token = 'fbWY2Zu6Qu+Q8Co45uItH3c7vMlgp13HeJkRib9XiSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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