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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011c9955d0e546800ee8135ce9acb0dbdd1bf549397ccced4a537c3650cd20b9' 
  AND token = 'lhZzpr9y2I7BCL7iqGC/WpeQeobEVtDOT45eB2y7VKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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