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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232530c93ca36ae1b024ecb4403546e6ebe5d358a224403587d3cf82c5dadb03' 
  AND token = 'tJ7Ehd+MJGzGsZLVkJM/5iJPsi3MHwA7tl6GlW6IOqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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