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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd739880c9bb1579e99de7818577c3fea60c94d654df97ce99a9176fd1657884d' 
  AND token = 'Olu7VUE4rS853Aqh3JhSR9bnO3DC81msqIB6IdiE4Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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