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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc78d71fdbf5d306f576b87049140e2be6b6e84da4e50a56e549b553b1e22e3' 
  AND token = 'Faf9h332cKDe3XzKQrD3dBIf+A5x+EKSPzjqm8EaXnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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