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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c1a4a60c920e9130be355ddbfab4a4a9c482e22c051f78edf6a7659583e9bc' 
  AND token = '2NbsukT66OWUqzkJlfVLTAMlrwlPEW0XNnuL8hAkAF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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