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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c2eb4814723e8af8cea79b393b534b79236d4593e1e54d89d796d4d382078b' 
  AND token = 'pWBdYTXIOrnGnl/Wl1m/1q+cim2QAdyuqG9t4arYKFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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