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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '353d1557aaafbdb78a62b96233403c0ed89d6b7b7a55a849bb0d4c8b7798b944' 
  AND token = 'XiHhdTUCawikVmk+ndwMLsW83ZKcW7g6uvzBAqSm028=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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