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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23670e3ce25f3bdfa483a564c5b5ea449bf8ee5e1b723ffe1020b1c4b650c272' 
  AND token = 'j/MsgKR/1TCbdTcbb68o8e3iV+xfsY3KqNhq7fJ1wYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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