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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e783cb43a9938d4926ea713df031702496813b7381c93210fa08c4d1b834ea' 
  AND token = 'hyWBgAexK7bQDRUV6wfSWn7P3A0tWtIieGLzQiGgr6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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