Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3dae610cbade7f709c94b78016095c66f259ad89421ab29164916151c977567' 
  AND token = 'F9QNPcpr5QSwwPVW8ahkcszDKHWiflXp58sJcb+MFoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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