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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7f605d2b9faa38ae886f961099f0f7929c46605b652afa2ab68f58f41cb91d' 
  AND token = 'SxewO7HDoqy62yYB+eUqAQKpHK9p6WTqPNLLmuvyOxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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