SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccde68cb874a97510f3e1693e9123bbe0af798e4b3118a1354923c79922ef39f' 
  AND token = 'jR7ZQVHaNpd2W/8YCQCvCJcLK0vBtS9ZMY/ojfxyWow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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