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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a010621531ae70315c63ab918e449012384f765e8886e7b4e4bd231664e22d38' 
  AND token = 'mA0pimDqDFvyBACPrFmR0q4MDNXgb4e2Yd+1ENJZGVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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