SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7113308c0e914ece250fa953358ac29436b28850fda1d2fdf8630c1e0b8b2a5a' 
  AND token = 'Lq5cYWHAxfxE2dAHHJlQjxo6zb/w7hPqbbIvN+mlQUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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