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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d4b9acaf12ea262ad7a7b1ebbb5fa1ba3ddbda4d9bc2833d61f19984b1a7323' 
  AND token = 'VRP9yM15abzaGLmND5SU6xEbQsbIvaNSp7yDwaPn8/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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