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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb24a10e9745dad3b723793d9ae0438d6a05d59491e2579736aea6ab444defef' 
  AND token = '0GJkLN0Hq4F9ujnGowCNjDtvJMPHBRfvbdUMlgB19BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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