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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '487cc082fc3eb5193a57065e85a8afcd9d479939e6a92d9e9dfe7e2e058933d1' 
  AND token = 'xQY14/xoX8tTB0GIORBhXDurPKmSIAONTeJFeT/DTDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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