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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ad98ac4501d14ebefe5a8252578d29712113e95b5bdefb41d2fb6297deaac0' 
  AND token = 'TleA5ien37Mp4c3G676NOSs3uFHhAY1Jmy4GTK2+AtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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