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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb33ae1240d09f68e09674ee04fcb7aa55c02673d4d62c148d646c24125a395' 
  AND token = 'QXiZDUQ2Sl60lxRvJ/NGIdalj1WYVyjNR+w4/h8A86s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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