Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '450585224a8a0708840d9ead7a549d5597190985b08151052cb81fb6dc05e0d2' 
  AND token = 'rfUpGLsCtof17QfQ1gi72q4wcDr0hagvAIRXArPbvGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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