SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06354498edfa57486cdb7f8e42c1ddede394d51595f52a7e2b7b939cb3df27ef' 
  AND token = 'D2MQVOVL2mhsnHtuICQlv0oBr1ctxfR+ejJbiwhvaKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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