SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804692ef80abfe7915535d1cc18a2fb67738f63991b25f79a03a6fa8a928fd8e' 
  AND token = 'n2M/4y3LhBqAPDxOI0cZUOI1pnKqrQJZrGPiJGoKUR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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