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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e5184cf9f033843f8d32018b8224c138ae5d110af21c34cb6661475399acce' 
  AND token = '5aXxe81BorMVNQCigDPqlpscTSY3ycOJdoOX4uGktVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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