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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b9c0209289ee96c91b5adf8353167e23c55f38a8b24b1e52dae31045f2b0c02' 
  AND token = '/o9sUylQJjEe2Qy0nk+fDEwbvxi2eVjVc2dcFbqO4Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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