SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1293e653a160b345bb9d024514513513cdd7df8c7cf085c34b86450bca2c887f' 
  AND token = 'OhfnrYUrkRXlx4HV6ZYvL/6GjGrUVexxgP070HXUQvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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