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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d3724c797c71e84fc440ad2784d02b4a4500ed9d28a744ee6fc274d1782ee4' 
  AND token = 'kYg1pEw/9AXWFkigawO9H420id4xNFyRl0xSusAyZmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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