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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c36d04c2779690da72cc7fa27cb38ca0bd7961fbb0f614d9e2af64d81408e1' 
  AND token = 'Z20XWoP2BgCBiBjIZz0HPg9B9O4tvzrMgYQX1gn6WP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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