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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e82afe7485480c4c6281e563d1074b81552f3b686bbd971a6e7ec8def81248' 
  AND token = '7U92l0OyqAw8Bhdx+Hmct2nuu7KfTKMzhFthFHKT6hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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