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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f27b7b14e5a96a88f6c90bc1cd238ed6113d025c1653a9cc16d813e2ce94b0' 
  AND token = 'DHEn21SvbteWnSHQVt9uq5jcOYVz4Yob/UOy9Pcyi9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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