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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518fd65ee8332fbaa4c5fecc6e9017aca392efb9a17f854d5092eb984beca1b0' 
  AND token = '/ZFqV43zHk5IYOesMiFlnNTVC6etHRDjfGWYbEW2/5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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