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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33250916d91a99c3ef1ee50488afd9e872c26d1bb07e6d1e241c355bfb3c2e3c' 
  AND token = 'W4mBp5IT7h92qB6Hn0olmK70EB/l0H+gxiEMsGhfmKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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