SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb3a0a6581deb02d5883c25306ea13f49f6a24f7486ec4b74895944fe52ec2d' 
  AND token = '184275oZzCq+k/HDURZnXgIBilPv79HvNtMFHctzywI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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