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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d64e9592f00c06d81c904e2b9f311094a7e02a271cb88c75304e153f318ab3c' 
  AND token = 'uK3eIWk8g8k/e/NEAZZ2MgfktAhRgX6MQEaJQTqOJrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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