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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a24b7c6de2e1080d7192f46c68106b1004ec322463382952cb00aa4e5fa0960' 
  AND token = 'SsfBbRivQcG14GK40c///Uz1CgGNoAQZMFRvIbmE/Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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