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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036c0825ada9b0b7df8020dd589db773f737113ec6f626fee27107a14a6da7b8' 
  AND token = '3YpMuLzYycbQRqRcZDUhO8vTuAyDO9os66gTIK8jUKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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