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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38331aa849aca424773a58bacd2e94eb5be70da7df1e8bf43a6c4092fba478db' 
  AND token = 's0JbWFnG3WH7Omdwtm/2tGbCU7DYVVuat/wdKUUVQRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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