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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41766f29922d6005517e80faeb6583cb9d56881851de2bb6fda6f49fb3dc1017' 
  AND token = 'fgM4ctKHdDunoVuvo5SISYsh4/73/3gm5KQX9oowI+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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