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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b1b94313d6c61325b5c18cbfb89bc7d9ceb6878f4ab176dd2f64d1b0aaf8a1' 
  AND token = 'x6iwMcjcCIpWghj8EGDU6wwoBsKSS6Q+s1cgx62ERM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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