SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23620466ec87f0423aeabf031d2458b06fdef4fa520ff9f8bb9fcd138142984' 
  AND token = 'qKUrsL1vE//RzhMH8BBih8XJF/j5HW045/dgKxcpw5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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