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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e11d1c803282224a6c4a92e87413da670dfcf373a68841d543c10ab6f42607b' 
  AND token = '+L3AzN9pJT2rtbLq9dWoq18VgeKpOHlSyQgrI88LvXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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