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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7175dfd449219952d56ab0b278d3c6fc329ce43f91603bd4082ca7e72196eb09' 
  AND token = '50CQixTsoxq9TjTpWskjrQrLk+lV4DnTkrbhkgqiIls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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