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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49d7d0d6f8798a786843cb057a9ab758edf51e920ac9acd84b8c7cfa2cb56bfb' 
  AND token = 'SMB2J10A1WpxLXr0D5MSjLDxEDjfmfW73pepvlhkiPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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