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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56c9a0080df14e67aaaf76c17fbbbad3075bc2174a6a54bd92ebda2079cfd08' 
  AND token = 'ET5bBjH50x6NXQ5l550+MibjL3eQTwrAYadRIkCFtWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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