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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbad31f04126b8d955baf0842802a161c175e943a6ace74084f8b904e4124c26' 
  AND token = 'eX+EDltxLGtDlRgCgL/v9H4gRLM34kObePpYdg83zTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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