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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31735fd80cbfc3793cc65ed46e0b7ac52090ca2414029ea9845c1b42fc928fe' 
  AND token = 'WjUoKF6Wn2hxuKcuy8wAanLR+526ee/aNDRbrDQHJFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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