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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c19eb078514d9124b7ca624d9b1b377b76abde85077774ef83c43a7e98252e2' 
  AND token = 'U8e4kiI+QzXedbvXmSrQ1lKz7Xs76p3T33ayfZ4GaJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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