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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c318791c8b6c79e3b81215743b3d45cbde8a3ff61782eb52e94a6e4b4f13f6ff' 
  AND token = '7vWPB4afwa1dQYV2h7AlqJNvAJ4d5Sk03Kg2C4VexJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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