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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3080b07d5f8a7fd7254d596fd3faa07894051056bfd2dce9445e2cc572b085' 
  AND token = 'q7J0lyBi7ZdBK8EGlmpID1QleukTyKAKi6a/xHi3UuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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