SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a757fc6d9dbfa99a7192849739cf1d7c432105b323802ee837cf668924700ce' 
  AND token = 'rCsZSPQGiPhTD/P4vZFtYaPiq6R6rzvge/DPod8+wIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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