SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72a014ed6b04c0fc7f83885eac42f44736eb23515051a6df3e4744174f63186' 
  AND token = 'qDHE+g1oiB2O7URIt8n3UAfKZ6jnhnHTgwqSP0HDQWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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