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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '627eef7e1bceca95bb8d61502f958291de29c2b1da01b779bfa77326cbf7be0a' 
  AND token = '7eo0cWWBkmDrKzAHCVxWOBPjVm8hwIUFBVk1FMrztCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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