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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5678c3ad744c6c2f1cf374ce869cd2189aa27fc2d08088a221fa663fab6a4824' 
  AND token = 'qZ2I/9ZWzyGWpLIWfoIWfw4ZosWQhl5u9ePTmLK/Avo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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