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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da75335255c1d0f3489cac34aa9449e6781247226cce3508c3145b993f97513' 
  AND token = 'oWXJFBzeXvg96KksjT+8pqta08UA73iyPISQ0BRqrug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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