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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b143f666cce390cf7cdb209cbcc069944f297d86e1b38ff57679582515f1e8ed' 
  AND token = 'Y8FyXyf0maRr47N1cQ2ymDzCxSRP5p3DhjpjOsDx/zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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