SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95280c77e105658566e9851f0dc477c3e6430c915d50207861f003ca069e73a' 
  AND token = 'eXRcDT/NqU/3VU1aC1t+cft9lFL0U4oqCEiUu4CS9Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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