SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1beec4707231095fc3fffdfd2dcf2a1cd0a9d41893a19f083bfb6f084b9e92d9' 
  AND token = 'bTB7JPsgjgZWlLJltGo4/xhYZY7xTe+YozSQkm6j7EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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