SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4373d65c184c1bf59df07f3b08d0be0212b037c2940ef641b0808fcafc8ed50' 
  AND token = 'GgYzVyCUKvvrotbWpMLljlM9x3lSCuX9YGaMZmjxKls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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